Electronic Brake System Dual Piston Actuator
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Solution Overview
Problem
Existing electronic brake systems face challenges in generating a stable and strong braking force, particularly when the actuator experiences faulty operations, and they lack independent control over the movement of pistons to optimize braking pressure and pedal feel.
Innovation Solution
The electronic brake system employs a double-acting actuator with a first and second piston, where the forward and backward movements of both pistons are independently controlled through interlocking units, elastic elements, and a volume elastic unit, allowing for better pedal feel and adaptive braking force generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single piston is used in the actuator, then the structure is simple, but the braking force stability and pedal feel are insufficient
Solution Approach 1:
The actuator is divided into two independent piston systems: a first piston connected to the pedal unit and a second piston connected to the wheel brake unit. Each piston operates independently within its own cylinder chamber, allowing separate control of pedal feel and braking force generation. This segmentation resolves the contradiction by enabling stable braking force through independent piston operations while maintaining manageable structural complexity.
2Ease of operation
If the first and second pistons are mechanically coupled, then the structure is compact, but the movements cannot be independently controlled
Solution Approach 1:
The actuator structure is segmented into two independent piston-cylinder systems. The first piston moves within the first cylinder chamber connected to the pedal unit, while the second piston moves within the second cylinder chamber connected to the wheel brake unit. This segmentation enables independent control of each piston's movement, allowing optimized pedal feel and braking force generation without mechanical coupling constraints.
3Adaptability or versatility
If a motor actuator is used to generate braking pressure, then automated braking control is achieved, but the system cannot cope with faulty actuator operations
Solution Approach 1:
The actuator is segmented into two independent piston systems where the first piston handles normal braking operations connected to the pedal unit, while the second piston is dedicated to faulty operation compensation connected to the wheel brake unit. This segmentation enables fault tolerance by allowing the second piston to compensate when the first piston or motor actuator fails, without requiring complete system redesign.
Solution Approach 2:
The system changes the operational parameters of the two pistons differently: the first piston responds to pedal displacement for normal braking, while the second piston is activated through interlocking units that engage under specific conditions. This parameter differentiation allows the system to adapt to faulty operations by adjusting which piston is active, enhancing fault tolerance without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables improved braking force stability and pedal feel by allowing independent control of piston movements, effectively addressing faulty actuator operations and enhancing the overall braking performance.
Implementation Method 1
an elastic element disposed between the plurality of interlocking units or by an elastic element disposed between the second piston and the interlocking units
Implementation Method 2
a first cylinder chamber hydraulically connected to a wheel brake unit, a first piston connected to a pedal unit so as to press an operating fluid stored in the first cylinder chamber
Data Source
AI summary
An electronic brake system is disclosed. The electronic brake system includes a first housing having a first cylinder chamber hydraulically connected to a wheel brake unit, a first piston connected to a pedal unit so as to press an operating fluid stored in the first cylinder chamber toward the wheel brake unit, and a second cylinder chamber connected to a reservoir unit through a flow passage opened or closed by an electronic control valve. The electronic brake system includes the second cylinder chamber, a volume of which is decided by forward and backward movement of a second piston. The second piston is activated by at least one interlocking unit such that forward and backward movement of the first piston and forward and backward movement of the second piston are performed independently of each other.